My favourite painting: Hannah Rothschild

Diana and Actaeon, by Titian (Tiziano Vecellio), 1488/90– 1576, 6ft by 6ft 7in, The National Gallery, London, and National Galleries of Scotland.

Hannah Rothschild says: This painting captures the moment when the hunter Actaeon accidentally disturbs the chaste goddess Diana and her nymphs bathing by a pool. In this single composition, Titian packs in as much drama as any full-length feature film. Dogs snarl, Actaeon recoils, women writhe, clouds scud and Diana spits. Actaeon’s grisly punishment is foretold by the stag’s skull and draped animal skins: moments later, Diana will turn him into a stag and he will be ripped to death by his own hounds. I love this painting's drama, pathos and beauty.

Hannah Rothschild is a writer and filmmaker. She took over the Chair of the National Gallery’s Board of Trustees on Monday. Her novel The Improbability of Love was published in May.

John McEwen comments: The Imperial Diest was the general assembly of the imperial estates of the Holy Roman Empire. Under the Emperor Charles V (1500–58), they took place at Bavarian Augsburg, Germany’s financial capital. In the 16th century, they were subject to the religious disputes of the early Reformation.

Titian seldom left Venice. Notable exceptions were when he was summoned to two Augsburg Diets, by Charles V in 1548 and, in 1550, by Charles’s son, the future Phillip II of Spain (1527–98). Both treated him with new respect for an artist. The story goes that, when painting the emperor’s portrait, Titian dropped his brush. The emperor picked it up and gave it back to him. ‘Sire, one of your servants does not deserve such an honour,’ said Titian. ‘Titian deserves to be served by Caesar,’ replied the emperor.

Charles needed art to give expression to his status as convention demanded, but Philip was an art lover and commissioned Titian to paint what he pleased. The result was seven scenes from Ovid’s Metamorphoses. This picture and a companion piece, Diana and Callisto, were subsequently in the Duke of Sutherland’s collection on loan to the National Gallery of Scotland. When the Duke recently put them up for sale, they were bought from the public purse. They are now shared between the National Galleries of Scotland and The National Gallery, London.

Lucian Freud considered them ‘the most beautiful pictures in the world’. he liked ‘the way that the more you look at them, the more dogs you seem to find’ and the curtain in this picture, ‘obviously done at the last minute out of pure joie de vivre’.